Corrected Fourier to Taylor (#3801)

Fixes #3797

Author: christopherporter1

learning/courses/quantum-diagonalization-algorithms/krylov.ipynb

@@ -990,7 +990,7 @@
    "source": [
     "### 3.1 Time evolution\n",
     "\n",
-    "Recall that the operator that time-evolves a quantum state is $e^{-iHt/\\hbar}$ (and it is very common, especially in quantum computing to drop the $\\hbar$ from the notation). One way of understanding and even realizing such an exponential function of an operator is to look at its Fourier series expansion. Note that this operation acting on some initial vector $|v\\rangle$ yields a sum of terms with increasing powers of $H$ applied to the initial state. It looks like we can just make our Krylov subspace by time-evolving our initial guess state!\n",
+    "Recall that the operator that time-evolves a quantum state is $e^{-iHt/\\hbar}$ (and it is very common, especially in quantum computing to drop the $\\hbar$ from the notation). One way of understanding and even realizing such an exponential function of an operator is to look at its Taylor series expansion. Note that this operation acting on some initial vector $|v\\rangle$ yields a sum of terms with increasing powers of $H$ applied to the initial state. It looks like we can just make our Krylov subspace by time-evolving our initial guess state!\n",
     "\n",
     "$$\n",
     "\\begin{aligned}\n",